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首页> 外文期刊>Chinese science bulletin >U-Pb dating of zircons from quartz diorite and its enclaves at Tongguanshan in Anhui and its petrogenetic implication
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U-Pb dating of zircons from quartz diorite and its enclaves at Tongguanshan in Anhui and its petrogenetic implication

机译：安徽Tong关山石英闪长岩及其飞地锆石的U-Pb定年及其成因意义

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摘要

The genesis of intermediate-silicic intrusive rocks and their enclaves in Tongling are closely related to Fe, Cu mineralization, which may provide petrologic information on lithospheric dynamics in this region. Tongguanshan quartz diorite and its enclaves, representatives of the Meso-zoic intermediate-silicic intrusive rocks in the Tongling area, were studied using approaches of petrography, electron microprobe mineral chemistry and the LA-ICPMS zircon U-Pb dating. The chemical compositions of pyroxene and amphbole in pyroxene-amphibole cumulate, quartz-diorite host rock from Tongguanshan show correlative variations. The Al contents of the minerals in pyroxene-amphibole cumulate are higher than those in the host rocks, indicating that the cumulate crystals were crystallized before the emplacement of host magma. The consistent mineral chemical compositions between the Tongguanshan quartz diorite and the microgranular diorite enclave indicate that the enclave and host rock were crystallized under similar conditions and therefore are closely genetically related. The LA-ICPMS zircon U-Pb dating suggests that the crystallization age of Tongguanshan quartz diorite is 137.5±1.1 Ma, consistent with the previous dates by different methods. However, the present U-Pb dating also revealed the presence of late-Archean relict cores, demonstrating that older lower crustal materials were involved in the generation of Mesozoic mag-matic rocks in this area. Furthermore, the dating results show that the crystallization age of the microgranular diorite enclave is 1.37.5 ± 2.4 Ma, the same as the crystallization age of the host magma. By integrating the previous Sr-Nd-Pb isotope data, it is also discussed the petrogenesis of quartz diorite and its enclaves in Tongguanshan.
机译：铜陵中硅质侵入岩及其围岩的成因与铁，铜矿化关系密切，可能为该地区岩石圈动力学提供岩石学信息。利用岩石学，电子微探针矿物化学和LA-ICPMS锆石U-Pb定年的方法研究了铜陵山中闪长岩侵入岩及其代表的铜官山石英闪长岩及其围岩。 Tong关山的辉石-闪石堆积物，石英-闪长岩主岩中辉石和闪石的化学组成表现出相关的变化。辉石-闪石堆积物中矿物的铝含量高于基质岩中的铝，表明堆积的晶体在进入岩浆之前就已经结晶了。 guan关山石英闪长岩与微颗粒闪长岩飞地之间的矿物化学成分一致，表明该飞地和基质岩在相似条件下结晶，因此在遗传上密切相关。 LA-ICPMS锆石U-Pb测年表明Tong关山石英闪长岩的结晶年龄为137.5±1.1 Ma，与以前的测年方法一致。但是，目前的U-Pb测年还显示出了晚期Archean遗迹岩心的存在，表明该地区中生代岩浆岩的生成与较早的下地壳物质有关。此外，定年结果表明，微粒闪长岩飞地的结晶年龄为1.37.5±2.4 Ma，与宿主岩浆的结晶年龄相同。通过整合以前的Sr-Nd-Pb同位素数据，还讨论了guan关山石英闪长岩及其围岩的成因。

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